. >>> the man accused of mailing a letter containing the poison ricin to president obama is expected back in court today. he has denied any involvement in the letter sent to the president or other letters sent to a senator and judge. his attorney says authorities have little evil connecting him to the evidence. >>> today marks three years since bp's deep water horizon oil platform sank in the gulf of mexico following a how long explosion. that explosion killed 11 workers. it also caused an oil leak that lasted for almost three months. almost five million barrels of oil leaked into the gulf of mexico. damaging marine and wildlife habitats as well as the fishing and tourism industries of the gulf coast. >>> 5:16 is the time. could be a little busier today. think most of all schools are back from spring break and people back from vacations. it could get crowded. >> it could. we are seeing people on the roads. we don't have a huge crowd just yet. let's take a look at the bay bridge toll plaza. it's not all that bad. traffic is looking good getting into san francisco. also the morning com